wow, either you are have split personality, or you are waving the white flag very quickly. You seemed sincere and reasonable in your first reply to me, but the below ones are weak, snarky, and signs of giving up in a debate. You are just waving your hand saying: "eat meat, vegetarianism $ucks, I have my hand over my eyes and ears, I can't hear you!" Weak. For example:
1) actually, they were quite good in some ultras. No one said they were olympic champions, but don't downplay the fact that they are EXTREMELY active, run a lot, and have produced some excellent ultra runners. (oh wait, they even beat Scott Jurek when he was in his best shape? But he's another "pu$$y" vegan, right? is that your argument? ). So their protein intake was ample for an extremely active and healthy lifestyle. THAT was the point you are trying to paper over.
2) this is a running site. If you want to promote a diet for power lifters, go for it. We were discussing (if you can remember that far back, what yesterday?) whether a rice and beans diet could give one enough protein and EAA's for distance running. It appears that it can. You were wrong, get over it.
3) people who want to reach a "healthy weight" will often achieve this by cutting sat fat and meat, eating more vegetable sources of protein (lentils, beans, soy, whole grains, nuts). I know, they don't always look RIPPED AND BUFF like they just came from juicing at X-fit, but, their healthy and look good. So it's relevant. Sorry chief.
Why does it have to be "efficient" ? Beans and whole grains provide many, many other nutrients, along with combining to give adequate protein. Know what is a more efficient way to get adequate protein than eating meat ? Whey shake. Know what is a more efficient way to get all your vitamins and minerals than...... eating? Vitamin pill. A healthy diet is not all about efficiency. And you said what one could not get enough EAA's from the "low quality" Rice and beans. Together they are not "low quality" protein. They just have to compliment each other, and they also contains lots of complex carbs (which is what a runner wants). Sounds efficient to me (but I drink milk also, and eat some meat. Yeah, it's easier and I like them. Still doesn't make vegetarians stupid)
You are the only one be "silly." Do really short people live longer than average height people? I was referencing a very healthy population that eats a low amount protein, and very little meat, something you said was "stupid." Their longevity and diet is as relevant as any other populations's diet, and CERTAINLY as relevant as your off the cuff nutrition "thoughts". Most long lived populations eat no or only small amounts of meat (i.e., low sat fat/cholesterol). It's relevant to what a healthy diet is, and whether or not "low" protein diets are unhealthy or not.
"back and forth" ??? What? I have been consistent and clear as possible. If you've suddenly lost interest, that's your problem.
One last time: one can easily get enough protein, iron, and every other essential nutrient on a vegetarian diet, and a vegan diet only lacks b12 (take a vitamin, but deal). But by adopting such diets, one also ups their fiber and phytochemicals/antioxidant intake and drops their sat fat and cholesterol intake ( and usually replaces with much healthier unsat fats), and often (due to satiety from bulk/fiber), one eats less calories. And yes, those are "INTELLIGENT" reasons to drop meat if you want to.
Great, one can eat small to moderate amounts of low sat fat meats and be healthy too. Great, fantastic, congratulations. But, contrary to your un-referenced and unproven assertions, such a diet is not healthier than not eating meat (see bold faced reasons above).